A high-pressure reciprocating pump leakage prevention device

Abstract

The utility model relates to a kind of high-pressure reciprocating pump leak-proof devices, including the sealing seat of being installed on pump body, the sealing seat is placed in plunger outer, and first sealing ring and second sealing ring are spaced apart along plunger axis direction and are set, the material and / or structure form of both are different. Pressure relief cavity is formed between first sealing ring and second sealing ring, and the pressure relief passage that is communicated with pressure relief cavity is equipped on sealing seat, for guiding discharge leaked fluid. Flow guide groove and check valve can be provided on pressure relief passage, to further improve the efficiency of pressure relief and anti-reflux ability. The device adopts differentiating double-sealing structure, combined with pressure relief buffer and one-way drainage function, effectively improves the sealing reliability, prevents medium leakage, suitable for sealing requirements under high-pressure, high-frequency reciprocating operation conditions, compact structure, easy to maintain, with good applicability and popularization value.

Description

Technical Field

[0001] This utility model relates to the field of reciprocating pump technology, and in particular to a leak prevention device for high-pressure reciprocating pumps, which is suitable for medium and high pressure working conditions such as hydraulic systems, water injection pump stations, and petrochemical plants. Background Technology

[0002] A high-pressure reciprocating pump is a positive displacement pump that uses the reciprocating motion of a plunger or piston to transport liquids. It is widely used in high-pressure liquid supply systems in industrial production. However, during the reciprocating motion between the plunger and the pump body, the sealing structure is subjected to high-pressure impact, high-frequency vibration, and media corrosion for extended periods, making it highly susceptible to leakage problems.

[0003] Existing high-pressure reciprocating pumps often employ a single-layer sealing ring structure. Due to long-term pressure and media erosion, the sealing rings are prone to aging, wear, and even detachment, leading to sealing failure. To address this, some solutions add multiple sealing rings at the sealing location. However, problems remain, such as identical sealing ring structures, inability to share pressure, and lack of early warning of failure, meaning leakage can still occur. Furthermore, the lack of effective pressure relief structures between the sealing rings creates sealed cavities between the multi-stage sealing structures, further increasing the load on the sealing rings and affecting sealing reliability and service life.

[0004] Therefore, it is necessary to propose a high-pressure reciprocating pump anti-leakage device with reasonable structure, smooth pressure relief, and more reliable sealing performance to solve the above problems. Utility Model Content

[0005] This utility model provides a high-pressure reciprocating pump anti-leakage device. By setting different types of sealing rings, constructing an intermediate pressure relief chamber and setting a pressure relief channel, it effectively reduces the sealing load, improves the sealing life, and significantly enhances the safety and stability of equipment operation.

[0006] The high-pressure reciprocating pump anti-leakage device provided by this utility model includes a sealing seat installed on the pump body and sleeved outside the plunger;

[0007] The sealing seat is provided with a first sealing ring and a second sealing ring at intervals along the axis of the plunger. The first sealing ring and the second sealing ring are both sleeved on the outside of the plunger, and the two are made of different materials and / or have different structural forms.

[0008] A pressure relief chamber is formed between the first sealing ring and the second sealing ring. The sealing seat is provided with a pressure relief channel communicating with the pressure relief chamber, which is used to discharge the fluid in the pressure relief chamber to the outside of the sealing seat.

[0009] Preferably, the first sealing ring has a V-shaped cross-section, and the second sealing ring has an O-shaped cross-section.

[0010] Preferably, the first sealing ring is made of nitrile rubber or fluororubber, and the second sealing ring is made of polytetrafluoroethylene.

[0011] Preferably, the pressure relief chamber is an annular gap formed between the inner peripheral wall of the sealing seat and the outer peripheral wall of the plunger at the axial interval between the first sealing ring and the second sealing ring.

[0012] Preferably, the sealing seat is provided with a conical guide groove, the wide end of the guide groove is connected to the pressure relief chamber, and the narrow end of the guide groove is connected to the pressure relief channel.

[0013] Preferably, a check valve is provided on the sealing seat, and the inlet end of the check valve is connected to the outlet of the pressure relief channel.

[0014] Preferably, the inlet end of the check valve is provided with a connector, which is threaded to the outlet end of the pressure relief channel.

[0015] Preferably, the sealing seat is threadedly connected to the pump body via an external thread, and an end face sealing ring is provided on the end face of the sealing seat that abuts against the pump body.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0017] By setting two types of sealing rings with different structures or materials, the diversity and redundancy of sealing performance are improved, reducing the impact of a single sealing ring failure on the overall sealing system. Furthermore, an independent pressure relief chamber is constructed between the two sealing rings, which is connected to the outside through a pressure relief channel, allowing high-pressure liquid to be discharged in a timely manner. This design effectively avoids pressure accumulation between the two sealing rings, reduces the pressure difference borne by the second sealing ring, and thus prevents the sealing ring from being squeezed out, deformed, or failing, greatly enhancing the sealing reliability of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the anti-leakage device for the high-pressure reciprocating pump of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the anti-leakage device for high-pressure reciprocating pumps when applied to a high-pressure reciprocating pump.

[0020] Explanation of reference numerals in the attached drawings: 10, pump body; 11, fluid passage; 12, inlet check valve; 13, outlet check valve; 20, sealing seat; 21, first sealing ring; 22, second sealing ring; 23, pressure relief chamber; 24, pressure relief passage; 25, guide groove; 26, check valve; 261, connector; 262, connecting pipe; 27, end face sealing ring; 30, plunger. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the high-pressure reciprocating pump anti-leakage device of this embodiment includes a sealing seat 20 installed on the pump body 10 and sleeved outside the plunger 30. The sealing seat 20 has a cylindrical structure, is sleeved on the outside of the plunger 30, and is connected to the threaded hole of the pump body 10 through external threads, forming a detachable and fixed structure, which is stable and convenient for later disassembly and maintenance. In order to enhance the sealing performance of the threaded connection, an end face sealing ring 27 is provided on the end face of the sealing seat 20 that abuts against the pump body 10, which further improves the sealing reliability at the interface.

[0023] The internal structure of the sealing seat 20 is provided with a first sealing ring 21 and a second sealing ring 22 spaced apart along the axial direction of the plunger 30. Both are set in the mounting groove on the inner peripheral wall of the sealing seat 20 and are tightly fitted onto the outer surface of the plunger 30. The first sealing ring 21 has a V-shaped cross section and is preferably made of nitrile rubber or fluororubber, which has good elasticity and recovery properties, adapts to the slight sway caused by the reciprocating motion of the plunger 30, and plays a primary sealing role. The V-shaped opening end of the first sealing ring 21 faces the liquid inlet direction on the side of the pump body 10, which can form an automatic sealing effect according to the fluid pressure. The second sealing ring 22 has an O-shaped cross section and is preferably made of polytetrafluoroethylene, which has excellent high pressure resistance, wear resistance and corrosion resistance, and plays a final sealing barrier role.

[0024] The aforementioned double-seal structure not only features differentiated design in form and materials, but also achieves division of labor and synergy in function. On the one hand, it improves the fault tolerance of the overall sealing system, and on the other hand, it can effectively extend the service life of each sealing element. This is the key innovation of this utility model that distinguishes it from traditional structures.

[0025] A pressure relief chamber 23 is formed between the first sealing ring 21 and the second sealing ring 22. The pressure relief chamber 23 is defined by the axial distance between the first sealing ring 21 and the second sealing ring 22, forming an annular closed space between the inner wall of the sealing seat 20 and the outer wall of the plunger 30. During the operation of the plunger 30, if the first sealing ring 21 leaks, the leaking fluid will temporarily accumulate in the pressure relief chamber 23 and will not directly enter the second sealing area, thus reducing the instantaneous pressure difference borne by the second sealing ring 22.

[0026] To promptly release the fluid in the pressure relief chamber 23, a pressure relief channel 24 communicating with the pressure relief chamber 23 is provided on the sealing seat 20. Considering that the fluid in the pressure relief chamber is confined to an annular space, which is prone to stagnation or local pressure fluctuations, a conical guide groove 25 is designed between the pressure relief chamber 23 and the pressure relief channel 24 in this embodiment. The wide end of the guide groove 25 communicates with the pressure relief chamber 23, and the narrow end communicates with the pressure relief channel 24. The fluid can be smoothly discharged under the guidance of the guide groove 25, avoiding the formation of turbulence or dead zones in the pressure relief path and improving the pressure relief efficiency.

[0027] To prevent external fluid backflow from interfering with the sealing area, a check valve 26 is installed at the outlet end of the pressure relief channel 24. Its inlet end preferably has a connector 261, which connects to the outlet of the pressure relief channel via a threaded connection. This design is compact and easy to install and disassemble. The check valve 26 not only prevents external pressure backflow but also avoids backflow of residual liquid in the pressure relief channel due to external vibration, thus improving the safety redundancy of the entire sealing system. The outlet end of the check valve 26 is connected to a recovery or alarm system via a connecting pipe 262 to store the pressure relief fluid or to provide timely alarm in case of leakage.

[0028] like Figure 2 As shown, when this high-pressure reciprocating pump anti-leakage device is applied to the overall structure of the high-pressure reciprocating pump, a fluid channel 11 is provided inside the pump body 10 for conveying the working medium. One end of the fluid channel 11 is equipped with an inlet check valve 12, and the other end is equipped with an outlet check valve 13. The inlet check valve 12 controls the medium to enter the pump chamber from the pump inlet, and the outlet check valve 13 controls the medium to discharge to the outlet under the push of the plunger 30, thereby achieving unidirectional orderly flow. The plunger 30 is driven by a drive assembly to achieve reciprocating linear motion. During its reciprocating operation, the double-seal structure in the sealing seat 20 continuously maintains a good sealing effect, preventing the medium from leaking into the gap between the pump body and the plunger, thereby improving the pump's service life and operational safety.

[0029] The leak-proof structure described in this embodiment significantly improves the sealing reliability of the high-pressure reciprocating pump under high-pressure, high-frequency reciprocating motion through a quadruple protection mechanism of "differentiated double sealing + pressure relief buffer + flow diversion and drainage + check valve protection". The overall modular structure of the device is suitable for various models of high-pressure reciprocating pumps, making maintenance and replacement convenient and possessing wide application value.

[0030] The above description is only a preferred embodiment of the present utility model. Those skilled in the art can make equivalent substitutions or modifications to its structure and form without departing from the concept of the present utility model, and all such modifications should fall within the protection scope of the present utility model.

Claims

1. A high pressure reciprocating pump leak prevention device, characterized by, Includes a sealing seat (20) installed on the pump body (10) and fitted over the plunger (30); The sealing seat (20) is provided with a first sealing ring (21) and a second sealing ring (22) at intervals along the axis of the plunger (30). The first sealing ring (21) and the second sealing ring (22) are both sleeved outside the plunger (30), and the two are made of different materials and / or have different structural forms. A pressure relief chamber (23) is formed between the first sealing ring (21) and the second sealing ring (22). The sealing seat (20) is provided with a pressure relief channel (24) communicating with the pressure relief chamber (23) for discharging fluid in the pressure relief chamber (23) to the outside of the sealing seat (20).

2. The high-pressure reciprocating pump leakage prevention device according to claim 1, characterized by, The first sealing ring (21) has a V-shaped cross-section, and the second sealing ring (22) has an O-shaped cross-section.

3. The high pressure reciprocating pump leak prevention device of claim 1, wherein, The first sealing ring (21) is made of nitrile rubber or fluororubber, and the second sealing ring (22) is made of polytetrafluoroethylene.

4. The high pressure reciprocating pump leak prevention device of claim 1, wherein, The pressure relief chamber (23) is an annular gap formed between the inner peripheral wall of the sealing seat (20) and the outer peripheral wall of the plunger (30) at the axial interval between the first sealing ring (21) and the second sealing ring (22).

5. The high-pressure reciprocating pump leakage prevention device according to claim 4, characterized by, A conical guide groove (25) is provided on the sealing seat (20). The wide end of the guide groove (25) is connected to the pressure relief chamber (23), and the narrow end of the guide groove (25) is connected to the pressure relief channel (24).

6. The high pressure reciprocating pump leak prevention device of claim 1, wherein, A check valve (26) is provided on the sealing seat (20), and the inlet end of the check valve (26) is connected to the outlet of the pressure relief channel (24).

7. The high-pressure reciprocating pump leakage prevention device according to claim 6, characterized by The inlet end of the check valve (26) is provided with a connector (261), which is threaded to the outlet end of the pressure relief channel (24).

8. The high-pressure reciprocating pump leak-proof device according to claim 1, characterized in that, The sealing seat (20) is threaded to the pump body (10) via an external thread, and an end face sealing ring (27) is provided on the end face of the sealing seat (20) that abuts against the pump body (10).

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